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If a number is subtracted from the square of its one half, the result is 48. The square root of the number is?

Correct Answer: 4

Explanation:

Let the number be N.
Then (N/2)2 - N = 48
⇒ N2/4 - N = 48
⇒N2 - 4N-192= 0
⇒ (N-16) (N+12) = 0
⇒ N = 16
∴ The square root of the number is 4.


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